I say yes....People use there ipods for way more than music now in days... and with jailbrake there going to be a even bigger homebrew apps then what the psp has....So if you still love brew then the Ipod touch is the place to be at the moment...and for the most part the ipod touch is really a upgrade from the 2 divces you got right now.. Now it really not a better music player then your zune but does everthing else great...It does video in a better screen than both your zune and pda.Better battery life then both.About 4 time litter than both(that may be to much but it still a hell of alot smaller.
IT not the best picture but you get the idea...Then on top of all that you get better internet(and the itunes store).Just think of any flaw that those 2 have and you might not see it in the ipod touch...
I want one myself but just cant seem to get myself to buy a
6th mp3 player for 300.If there ever going to be a 4gb for 199 or somthing then I be sure to get it...